The program can be used to do relatively common tasks, like combining two or more photos to create a panorama, or putting together two documents whose individual dimensions exceed the size allowed by the scanner.
As soon as you start the program, a tutorial will guide you through all its different options, making it near impossible to have difficulties utilizing any of its default features.
RasterStich has a simple interface and a number of options wide enough to cover all your needs without being overwhelming. And if, as mentioned above, any difficulty should come up, its interface will surely help you to get out trouble.
Trial version has some limits on features.